When to use the [id] and the [class] selectors
In styling HTML, there are two ways (that i know of) to choose which elements are styled in what way.
The [id] selector is used for single, unique elements. The [class] selector is used for multiple elements that are not unique.
This can be seen in the code for my home page; Where I use the [id] selector for the Discord and Twitter logos to accordingly style the span they are in, and the [class] selector for the anchor tags attached to the svg elements as they are not unique in any way
Now, it could be said that this is a very bad example but hey; progress not perfection.